In early pregnancy, the increase in estrogen in the body causes water and sodium retention, so it causes mild edema in the mucosa of the gastrointestinal tract, which can cause clinical symptoms such as nausea, vomiting and anorexia in pregnant women. The severity of vomiting at night is mainly caused by being in a fasting state. It is advisable to eat less easily digestible food in the evening. In addition, drinking a glass of hot milk can also relieve vomiting at night. In case of nausea and vomiting during pregnancy, try to eat if you can, to avoid aggravating nausea and vomiting in an empty stomach. In addition, if you cannot eat, go to the hospital as soon as possible to give rehydration fluids for treatment.